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Sea to Summit Reactor Insulated Sleeping Bag Liner

4.6 4.6 out of 5 stars 2,090 ratings

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Extreme (83 X 35)

About this item

  • thermolite
  • Imported
  • Insulated sleeping bag liner adds extra warmth and personal hygiene to any sleeping bag
  • Reactor Extreme features heavier weight Thermolite throughout and adds up to 25F degrees
  • Thermolite hollow core insulation is lightweight, soft and comfortable with stretch knit construction
  • Mummy shaped with toe-box, draw cord hood and included stuff sack
  • Extreme (M) Dimensions 83 x 35-inches; packed size 6.5 x 4.5-inches; weight 14oz

From the brand


Product Description

Sea to Summit stands for a culture of design perfectionists who develop ingenious, functionally beautiful products with an independent, free-thinking Australian attitude. We strive to create equipment that is nimble and light, but serious enough to deliver when called into duty. Gear that works just that little bit better, so you may find yourself inspired to take the less-traveled road more often.

Ingenious. Functional. Reliable. Unconventional. Inspiring.

extreme

Thermolite Reactor Extreme Liner

The THERMOLITE Reactor Extreme is the warmest backpacking knit sleeping bag liner we offer. The hollow fiber threads work just like the hollow fur of a polar bear in that they trap heat effectively. When the mercury drops you'll appreciate the mummy shape and drawcord hood with mini cord lock attached. Depending on your environment and sleep conditions, this liner can increase your sleeping bag warmth by up to 25F.

thermolite

THERMOLITE FABRIC

The Reactor Series Sleeping bag liners and the foot boxes of the Women’s Trek, Talus and Latitude Sleeping Bags use hollow core THERMOLITE fiber to add warmth. Hollow cores fibers trap extra air for insulation (just like the hollow-cores of polar bear or caribou fur). Knitted THERMOLITE fabric is soft and stretchy and comes in three different weights: 80g/m² fabric used in the Reactor and the underside of the Compact Plus liners; a 110g/m² fabric which is used in the Extreme, and the core and foot box of the Compact Plus liner; and the Fleece, the warmest of all the fabrics.

warmth
line drawings

HIGHLIGHTS

Packed Size Comparison:

Similar to a red cup that is solo.

Weight:

14 oz ≈ Lighter than a roll of paper towels. Warmth:

Adds up to 25°F to the temperature range of your sleeping bag.

BONUS:

Easy to wash and helps to keep your down bag cleaner for longer.

Product Description

Sea to Summit Reactor series insulated sleeping bag liners can extend the comfort range and improve personal hygiene of any sleeping bag. Thermolite hollow core fibers are constructed like the fur of a polar bear, efficiently trapping heat and providing a luxuriously soft, comfortable feel. The stretch-knit fabric provides optimal comfort, and ensures the Reactor fits any sleeping bag. Additionally, the drawcord footbox offers plenty of ventilation and the versatility of walking around camp while still wearing your liner. Available in three different weights, Reactor technical liners make your existing sleeping bag warmer and more versatile. The Regular Liner uses hollow-core Thermolite Pro fabric with infra red-absorbing ceramic pigments and Thermolite EcoMade fibers. This lightweight fabric adds up to 14F of warmth to your sleep system. The Extreme Liner features a thicker hollow-core Thermolite Pro fabric to add up to 25F of warmth to your sleep system. The Fleece Liner employs hollow-core Thermolite Pro fibers in a grid-pattern to deliver our warmest sleeping bag liner which adds up to 32F of warmth to your sleep system.

Product information

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Sea to Summit Reactor Insulated Sleeping Bag Liner


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Customer reviews

4.6 out of 5 stars
4.6 out of 5
2,090 global ratings

Customers say

Customers like the weight, comfort, quality and performance of the sleeping bag liner. They mention that its very compact, easy to carry as a supplement to the sleeping bg and that the fabric is very comfortable and breathable. They are also happy with warmth, and ease of cleaning. That said, some are disappointed with the value and have different opinions on thickness.

AI-generated from the text of customer reviews

159 customers mention134 positive25 negative

Customers like the warmth of the sleeping bag liner. They say it adds every bit of extra warmth advertised, and it's a decent way to extend the thermal range of a sleeping bag. It keeps them toasty without sweating, and eliminates the natural cold spots they get in a bag when not used. It's also a great ultralight product perfect for summer nights and as a liner to keep them warmer on the crisp nights.

"...This liner not only made my sleeping bag cozy but added every bit of extra warmth advertised and some...." Read more

"...If you want to camp in the cold, you NEED this liner. It’s warm, cozy, easy to use, easy to clean…...." Read more

"Got of a recent winter camping trip and feel like it did add some warmth to my 20 F degree bag. It’s very soft and light weight...." Read more

"...to go light weight and use a snugpak jungle bag and this is great for some extra warmth." Read more

90 customers mention85 positive5 negative

Customers like the weight of the sleeping bag. They mention that it's very compact, and easy to carry as a supplement to the sleeping bags. It's warm, comfortable, and is easy to pack.

"...Turns out my favorites use for it is as a summer bag. It’s very small when packed compared to a sleeping bag and works well to keep you comfortable..." Read more

"...It’s very soft and light weight...." Read more

"...It is comfortable, light and easy to wash." Read more

"...Really impressed with performance given the weight and compact storage. Can’t wait to use this on the trail. Passes the test in my book." Read more

69 customers mention69 positive0 negative

Customers like the comfort of the sleeping bag. They mention that the fabric is very comfortable and breathable, and it works well to keep them comfortable on backpacking or bikepacking trips. They also mention that it is comfortable down to just below freezing, as long as they have a thick beanie, and the bag liner is soft and comfortable to the touch. Overall, customers are happy with the comfort and warmth of the product.

"...The second night so cold our water froze. This liner not only made my sleeping bag cozy but added every bit of extra warmth advertised and some...." Read more

"...If you want to camp in the cold, you NEED this liner. It’s warm, cozy, easy to use, easy to clean…...." Read more

"...’s very small when packed compared to a sleeping bag and works well to keep you comfortable on a backpacking or bikepacking trip on warm nights...." Read more

"...It’s very soft and light weight...." Read more

51 customers mention46 positive5 negative

Customers like the performance of the sleeping bag. They say it's light weight, portable, and does the job. Customers are also impressed with the warmth and comfort it provides. Some say that the red coloring does rub off on sheets and sleeping back, but the bag is well-made and adequate. Overall, customers find the product to be a great choice for backpacking.

"This SeatoSummit product performs very well, and may be the best money I've spent as I figure out products that work well for me...." Read more

"Worked perfect for my very cold night camping, would’ve been a struggle without this" Read more

"...It takes up a small amount of space. Perfect for my purposes." Read more

"This is a really good backpacking gear...." Read more

51 customers mention44 positive7 negative

Customers like the quality of the sleeping bag liner. They say it's well-made, feels smoother on their skin, and is an amazing addition to the sleeping bags. It works well as a summer sleeping bag and is a fantastic addition to their pack.

"Really satisfied with the feel of the material, the durability, and effectiveness of the bag liner...." Read more

"...2. ❤️❤️❤️❤️🤍 Quality; The craftsmanship of this product is truly impressive. The fabric feels incredibly soft with a silky and cool texture...." Read more

"This is a great bag liner that I'm sure adds some warmth, but I'd bet my life that it is nothing even close to 25° of added warmth under any..." Read more

"...The Reactor Extreme is great for camping, emergency kits and bug out bags because it can eliminate the need for a big, OR BIGGER, heavy, bulky, bag..." Read more

25 customers mention25 positive0 negative

Customers find the ease of cleaning of the sleeping bag to be a great feature. They mention that the lining keeps the bag clean and prevents dirt, oil, and grime from getting inside. They also appreciate the ease to wash the bag.

"...I also love the lining between dirty, several days into the trip body and the sleeping bag...." Read more

"...It’s warm, cozy, easy to use, easy to clean…. My dog got into my sleeping bag with me and it’s safe to say that she approves too!" Read more

"...It’s also much easier to wash than a sleeping bag. So it’s nice to use on trip you might be rolling a little grubby...." Read more

"...It is comfortable, light and easy to wash." Read more

24 customers mention8 positive16 negative

Customers are mixed about the thickness of the sleeping bag. Some mention that it's like a fleece and not super warm, while others say that it is really thin and can be seen through. However, some customers find it comfortable.

"...to use it for camping or other purposes I still think it's a bit too thin for sleep...." Read more

"...The feel of the material is nice and soft. Its like a fleece. Its thin. If you hold it up to the light you'd see right through it...." Read more

"...It's just too thin - air goes straight through it, so it doesn't really "insulate"...." Read more

"...It is a stretchy, rather thin weave and I simply could not believe it would add warmth to my bag...." Read more

41 customers mention12 positive29 negative

Customers are not satisfied with the value of the sleeping bag liner. They mention that it is not useful on its own, and it's not worth the price.

"...However, it doesnt hold warm air in, so it's not very useful on its own over a blanket...." Read more

"It's more expensive than others, and I wasn't completely sure how much it helped, as the few times I have used it so far have been on abnormally..." Read more

"...Well worth the extra money and space in the pack...." Read more

"...Now for the downside..... it's expensive but let's face it sometimes the comfort is worth it...." Read more

Great liner and very comfy
5 Stars
Great liner and very comfy
I bought a sub zero sleeping bag and tried it without the liner first to see how warm it would keep me in 18° weather. I also had a barrier between me and the ground. The sleeping bag did not keep me warm. But after I put this on I am Immidently felt much warmer and it kept me Comfortable throughout the night. I would definitely recommend this even though it does cost a fe comfortable throughout the night. I would definitely recommend this even though it is expensive
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Top reviews from the United States

Reviewed in the United States on March 9, 2024
Style: Fleece (79 X 28)Verified Purchase
Reviewed in the United States on January 17, 2024
Style: Regular (83 X 35)Verified Purchase
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Reviewed in the United States on January 3, 2024
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Reviewed in the United States on July 9, 2023
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Reviewed in the United States on October 22, 2023
Style: Extreme (83 X 35)Verified Purchase
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Reviewed in the United States on September 2, 2023
5 people found this helpful
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Top reviews from other countries

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MARCELO TOSCANO
5.0 out of 5 stars Leveza
Reviewed in Brazil on February 27, 2024
Style: Regular (83 X 35)Verified Purchase
Pasi Mammela
4.0 out of 5 stars Lättvikt
Reviewed in Sweden on March 2, 2024
Ugo de Veredicis
5.0 out of 5 stars Ottimo prodotto a prezzo conveniente
Reviewed in Italy on February 27, 2024
Style: Fleece (79 X 28)Verified Purchase
peter sands
5.0 out of 5 stars Warm
Reviewed in the United Kingdom on January 31, 2024
Style: Women's (72 X 35)Verified Purchase
Dario
5.0 out of 5 stars Consigliato
Reviewed in Italy on November 30, 2023
Style: Extreme (83 X 35)Verified Purchase